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European Conference on Object-Oriented Programming

ECOOP 2001: ECOOP 2001 — Object-Oriented Programming pp 2–27Cite as

Capabilities for Sharing

A Generalisation of Uniqueness and Read-Only

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Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 2072))

Abstract

Many languages and language extensions include annotations on pointer variables suchas “read-only,” “unique,” and “borrowed”; many more annotations have been proposed but not implemented. Unfortunately, all these annotations are described individually and formalised independently — assuming they are formalised at all. In this paper, we show how these annotations can be subsumed into a general capability system for pointers. This system separates mechanism (defining the semantics of sharing and exclusion) from policy (defining the invariants that are intended to be preserved). The capability system has a welldefined semantics which can be used as a reference for the correctness of various extended type systems using annotations. Furthermore, it supports researchin new less-restrictive type systems that permit a wider range of idioms to be statically checked.

Work supported in part by the National Science Foundation (CCR-9984681) and the Defense Advanced Research Projects Agency and Rome Laboratory, Air Force Materiel Command, USAF under contract F30602-99-2-0522. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the National Science Foundation, Defense Advanced Research Projects Agency, Rome Laboratory, or the U.S. Government.

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Author information

Authors and Affiliations

  1. University of Wisconsin-Milwaukee, USA

    John Boyland & William Retert

  2. Victoria University of Wellington, New Zealand

    James Noble

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  1. John Boyland
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  2. James Noble
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  3. William Retert
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Editor information

Editors and Affiliations

  1. Department of Computer Science, University of Aarhus, Åbogade 34, 8200, Århus N, Denmark

    Jørgen Lindskov Knudsen

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© 2001 Springer-Verlag Berlin Heidelberg

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Boyland, J., Noble, J., Retert, W. (2001). Capabilities for Sharing. In: Knudsen, J.L. (eds) ECOOP 2001 — Object-Oriented Programming. ECOOP 2001. Lecture Notes in Computer Science, vol 2072. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45337-7_2

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  • DOI: https://doi.org/10.1007/3-540-45337-7_2

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  • Print ISBN: 978-3-540-42206-8

  • Online ISBN: 978-3-540-45337-6

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